Filament lamp with pinch-sealed base plate-shaped terminals connecting an outer lead to a feed line

Abstract

A filament lamp with bases in which the pinch seal areas are not damaged and no adhesive is used is achieved by the base of a filament lamp with bases having, in its front area, a holding part for holding a pinch seal area and a first opening into which an outer lead pin is inserted, and in its rear area, a second opening into which a plate-shaped terminal is inserted. Furthermore, the base has another opening, between the first opening and the second opening, which is used to weld the outer lead pin to plate-shaped terminal in a direction which orthogonally intersects the lengthwise direction of the base and orthogonally intersects the wider crimped foot surface of the pinch seal area. The plate-shaped terminal has a size such that it does not fall out of the second opening of the base. The terminal is welded to the outer lead pin such that its flat surface is parallel to the pinch seal area.

What we claim is:  
     
       1. Filament lamp with bases, comprising: 
       a tubular bulb with a pinch seal area formed on each end, the pinch seal area being flattened so as to form a wide crimped foot surface;  
       a filament which is located within the bulb along a longitudinal axis of the tubular bulb;  
       outer leads, each of which is electrically connected at an inner end to a respective end of the filament and projects out of respective pinch seal area;  
       plate-shaped terminals, each of which electrically connects an outer end of a respective one of the outer leads to a feed line; and  
       bases made of a ceramic material for protection of the plate-shaped terminals;  
       wherein each ceramic base has a concave holding part on one side for holding of the respective pinch seal area and a first opening into which the respective outer lead is inserted, and on an opposite side, has a second opening into which the respective plate-shaped terminal is inserted;  
       wherein a through opening is located between the first opening and the second opening for enabling the outer lead and the plate-shaped terminal to be welded to one another in a direction which orthogonally intersects a lengthwise direction of the base and orthogonally intersects the wide crimped foot surface of the pinch seal area in the holding part; and  
       wherein the respective plate-shaped terminal has a flat planar surface which is larger than the first opening of the base and is welded to the outer lead with a flat plane thereof parallel to the wide crimped foot surface of the pinch seal area.  
     
     
       2. Filament lamp with bases as claimed in  claim 1 , wherein the holding part of the respective base has essentially the same shape as that of the pinch seal area received therein; and wherein a distance between a side of the pinch seal area from which the outer lead does not project, and a facing inner side of the holding part is smaller than a distance between the outer lead, which penetrates the first opening of the base, and a peripheral edge area of the first opening.